Pressure-sensitive recording material

Details Pressure-sensitive recording material Pressure-sensitive recording material

1980-08-18

1982-07-13

Hess, Bruce H.

Textiles: manufacturing

428206, 428207, 4283155, 4283157, 4283159, 4283202, 4283204, 4283206, 4283215, 428323, 428326, 428484, 428488, 428537, 428914, B41M 522

Patent

active

043391435

DESCRIPTION:

BRIEF SUMMARY
FIELD OF TECHNOLOGY

This invention relates to a pressure-sensitive recording material which can produce multiple copies when pressure such as printing or writing pressure, is exerted thereon. More specifically, it relates to a pressure-sensitive recording material having a surface coated layer of a novel structure.


BRIEF DESCRIPTION OF THE DRAWINGS

FIGS. 1 to 3 are examples of prior art pressure-sensitive recording materials in which two color-forming components are coated on the surfaces of supports in a face-to-face relationship;
FIGS. 4 and 5 show examples of coated layers in the present invention; and
FIG. 6 shows an example of a spot-type pressure-sensitive recording business form which utilizes the pressure-sensitive recording materials of this invention. All of these drawings are cross-sectional views.
In the drawings, 1 represents a support; 2, a microcapsular layer containing a liquid comprising a color-forming agent; 3, a layer of a solid containing a coloring agent; 4 and 5, layers formed by spot-coating only the desired portions with a hot-melt type coating containing a color-forming agent; 5', a layer formed by coating the entire surface with the hot-melt type coating; and 6, a layer having absorbent micropores consisting of microcapsules, a fine powder and a binder.


BACKGROUND TECHNOLOGY

Pressure-sensitive recording materials having two color-forming components coated on the surfaces of separate supports, which have conventionally gained widespread use, are of the type shown in FIG. 1. Specifically, one of the color-forming components is encapsulated in microcapsules (2) and coated on the undersurface of an upper support (1), and the other color-forming component is present as a coated layer (3) on the top surface of a lower support (1). When a printing or writing pressure is applied to such a pressure-sensitive material, the liquid contained in the microcapsules (2) flows out and is transferred to, and absorbed by, the coated layer (3), and simultaneously, the two color-forming components react with each other to form a colored substance and thus to form an image on the receptive surface of the coated layer (3).
When, in the material of the type shown in FIG. 1, the upper support and the lower support are superimposed and cut or bent, colored stains occur at the parts to which pressure is applied. There is known a pressure-sensitive recording sheet in which microcapsules (2) containing a color-forming component are spot-coated on the undersurface of the upper support, as shown in FIG. 2, in order to inhibit or avoid the occurrence of such an inconvenience. In practice, however, the stop-coating of microcapsules is difficult, because tough capsules which withstand spot-coating are difficult to obtain, and creases form on the coated support because of the use of a water-base coating, etc.
It was thus proposed to form a transferable spot-coated layer (4) by spot-coating a so-called hot-melt ink resulting from the dispersion of a color-forming component in a hot-melt type wax on the undersurface of the upper support (1), as shown in FIG. 3. Although in this type, the color-forming components contained in the transferable coated layer (4) and the receptive coated layer (3) are enveloped by another component (e.g., wax, binder, etc.), when the upper support and the lower support are handled in the superimposed state, colored stains occur under an unexpected exterior force. Furthermore, when a printing or writing pressure is applied, the transferable coated layer (4) is transferred to the receptive coated layer (3), and conversely, the receptive layer (3) is transferred to the transferable layer (4). This results in the formation of an image on both coated layers, and the rate of color formation and the density of the color formed in the receptive coated layer are frequently reduced. If, in an attempt to remove such an inconvenience, the formulation is changed so that the transferable coated layer (4) may not easily be transferred, color formation upon the application of a printing or writin

REFERENCES:
patent: 3079351 (1963-02-01), Staneslow
patent: 3684549 (1972-08-01), Shank

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